mkgrady
Senior Member
- Location
- Massachusetts
I'm just finishing a home renovation where the owner wants Nest tstats to control heat and AC. The heat is forced hot water baseboard using taco zone control panels. There are 10 tstats total. One is AC only and working with no problems. Six are heat only and working with no problems and three control both heat and ac. These three are having problems. In these three I have tried using the common wire from the heat system and from the ac system.
In either case the heat for these zones comes on briefly, intermittently and sporadically even though it is not calling for heat. The frequency of these malfunctions depends on how many of the heat/cool tstats I connect. If I connect just one there are no problems. As soon as I connect more than one the three heat zones come on. My only thought is to add three more nests to keep the system wiring totally seperate but the owner will not be happy with that solution.
In either case the heat for these zones comes on briefly, intermittently and sporadically even though it is not calling for heat. The frequency of these malfunctions depends on how many of the heat/cool tstats I connect. If I connect just one there are no problems. As soon as I connect more than one the three heat zones come on. My only thought is to add three more nests to keep the system wiring totally seperate but the owner will not be happy with that solution.